Hard-line Iranian protesters have stormed the British diplomatic compound in Tehran, hauling down the Union Jack, torching an embassy vehicle and pelting buildings with petrol bombs in what began as an apparent state-approved show of anger over the latest Western sanctions to punish Iran for defiance over its nuclear program. (AFP/Atta Kenare)

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The hours-long assault on the British Embassy and a residential complex for staff in chaotic scenes reminiscent of the seizing of the U.S. Embassy in 1979 could push already frayed diplomatic ties toward the breaking point. (Getty Images)

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Calling the attack 'outrageous and indefensible,' British Prime Minister David Cameron said that Iran's failure to defend the embassy and its staff was a disgrace and would have 'serious consequences.' (AFP/Atta Kenare)

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The late-afternoon demonstration outside the British Embassy was organized by pro-government groups at universities and Islamic seminaries, and could not have taken place without official sanction. (AFP/Atta Kenare)

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Riot police initially clashed with mobs in attempts to hold them back, but protesters surged past cordons and scaled the walls at the embassy complex, which they pelted with petrol bombs and stones. (Reuters)

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